I don't think we have the chance for getting a girl with a 90 spin, so it's best to do a 900 one to get the guaranteed girl. But if you would like to gamble, do post your gacha results, for science.
Currently playing: Aigis, Harem Heroes and Crush Crush
Well, i have 695 Kobans rn, will have 300 for Dailies, and around 180 for Event Missions. This will give me 1175 Kobans in the last day of event, excluding other sources. Is it big number to try 90's?